System of motor control



March 17, 1925. 1,530,377

G. LAMBERTON SYSTEM OF MOTOR CONTROL Filed Aug. 1921 2 Sheets-Sheet l famw Ari fiarvdn March 17, 1925- 75 11+ 63 jijgf.

G. LAMBERTON SYSTEM OF MOTOR CONTROL 2 Sheets-Sheet 2 Filed Aug. 6, 1921 N jnvenzor;

Patented Mar. 17, 1925.

GEORGE LAMBERTON, O'F ELYRIA, OHIO.

SYSTEM OF MOTOR CONTROL.

To aZZ whom it may concern:

Be it known that I, GEORGE LAMBERTON, a citizen of the United States, and resident of Elyria, in the county of Lorain and State of Ohio, have invented certain new and useful Improvements in Systems of Motor Control, of which the following is a specificatron.

This invention relates to pusher machines for coke ovens and more particularly to control mechanism ,for the rams of such machines, and has for one of its objects the provision ofa control mechanism that will automatically slow down the movement of the ram as it approaches the end of its movement in either direction and further will automatically stop the ram when it has traveled a predetermined distance.

Another object is to provide a control mechanism that may readily be applied to existing pusher machines without altering their construction and design.

The above and other objects will be more clearly brought out in the following specification and illustrated in the accompanying drawings, in which:

Figure 1 is a somewhat diagrammatic side elevation of a coke pushing machine in position in front of a coke oven shown in section.

Figure 2 is an enlarged detail view of the pusher ram and the associated carriage parts. I

Figure 3 is a diagram of the circuits for operating the driving motor for the pusher ram.

Referring particularly to the drawings,

the numeral 2 designates the wheeled carriage of the machine as a whole, which is provided with flanged wheels 3 adapted to travel on the rails 4.

One pair of the wheels 3 serve as traction wheels and are suitably geared to a power shaft (not shown), which is driven by a suitable motor on the carriage (not shown). The carriage 2 is adaptedto move along -a battery or batteries of ovens A and is provided with a ram 8 having a coke engaging head 9, which ram is mounted for movement into and out of the ovens. The ram 8 is guided in its movement by guide rollers 10 and driven by a pinion 11 which .meshes with a rack 12 on the under face of the ram.

The pinion 11 receives its power from a motor 13 mounted on suitable supports on said carriage through a train of reducing Application filed August 6, 1921. Serial" No. 490,344.

gearing as follows: The motor 13 is provided with a pinion gear 14 which meshes with a gear 15 on a jack shaft 16, which has a pmlon l7 thereon in meshwith an intermediate gear 18 on the shaft of the drive pinion 11.

The usual bumping blocks 19 are provided at each end of the ram 8 to prevent the overrunning of the ram and the motor 13 *may be provided with a solenoid brake if desired, which would exert braking power on the motor armature when the circuit is broken to the motor as is usual in the operation of such brakes.

The operation of the ram motor 13 is controlled by an operatorby means of a hand operated master controller 22 of well known construction, indicated in the wiring diagram of Figure 3.

In addition to the hand operated master controller an automatic slow-down and limit switch Y'is provided for slowing down the speed of travel of the ram as it approaches the end of its travel in either direction and for breaking the circuit to the motor 13 when the limit of travel is reached. The slow-down and limit switch Y comprises a threaded shaft 25 having a gear 26 on its one end which is in mesh with a gear 26 bolted to the gear'18 of the driving gear train, so that the switch receives its operating power from the motor 13 and is revolved as the motor is operated, also a contact operating nut 27 is threaded on shaft 25 and adapted to travel along the rod as said rod is rotated. A plurality of contacts 28 and 28, 29 and 29 30, 30 and 30 31, 31 and 31 are provided with fingerswhich extend into the path of travel of the nut 27 and are actuated thereby.

The master controller 22 controls a magnetic controller having reversing switches 32, 33, 34 and 35 and an accelerating switch 36.

The operation of the control apparatus for the ram motor 13 will now be described in detail, reference being had to the wiring diagram of Figure 3. The diagram shows the limit switch and controller in the position they would take when the ram was at its extreme limit of travel out of the oven. Starting in this position and tracing the control through one cycle, the operation wouldbe as follows: To move the ram into the oven, the drum of master controller 22 would be moved one notch in the direction of the arrow marked In. A control circuit is then established from minus side of master switch .37 through wire 38 to master controller,

5 through drum of controller to wire 39 to limit switch Y, through contact 28 to wire 40, to magnetic coils of switches 34 and 35, through these coils to wire 41 and contact 28 0f limit switch Y to wire 42 and plus side of master switch 37 thus closing switches 34 and 35 and thereby completing the forward circuit to the motor 13 to move the ram into the oven. The forward'circuit thus completed is as follows-from the 15 positive or plus side of main switch 63 to wire 64, then through. switch 35 and wire 65, to the armature of motor 13, to wire 66, then through switch 34, wires 67 and 68, series field 69, and wire 70, to starting resistance 71 and wire 72 to the negative or minus side of switch 63. Simultaneously with the making of the above circuit, shaft of switch Y will be rotated since it is geared to the motor 25 13, and nut 27 will be moved in the direction of the arrow marked In closing contacts 29 and 29 and when ram has reached a predetermined distance the nut 27 will be advanced sufliciently to close contact 30,

30 open 30* and close 30 master controller 22 is now moved to second notch a control circuit will be established from minus line of master switch 37 through wire 38, through drum of controller 22 to wire 44*" to contact 30 of limit switch Y through wire 44, to contact 31 of limit switch Y, through wire 45 to magnet coil 46 of accelerating switch 36,

through wire 47, contacts 31, 30 and to plus side of master .switch 37, thus closing accelerating switch 36 and bringing motor 13 up to full speed.

The motor 13 will continue to run at full speed .until nut 27 has advanced along the 4 shaft 25 sufliciently to open contacts 31 and 31 and close contact 31 Opening of contacts 31 and 31 opens the circuit to magnet coil 46 of accelerating switch 36 through wires and 47 thus opening this switch.

50 The opening of contacts 31 and 31 may be timed to takeplace at any point in the travel of the ,ram by adjusting said contacts relative to ,the nut 27. -Closing of contact 31 closes slow-down switch 50 by the following circuit, from lus line of master switch 37', wire 4 contact 30 remainder of wire 47, contact 31 wire 51 to coil 52' of slow-down switch, thence through wire 40 to contact 28 of limit 60. switch to wire 39 through the drum of master controller to wire 38 to the minus side of master switch 37. Closing of slow-down switch 50- connects slow-down resistance 53 in parallel with the armature es of the ram motor 13, thus reducing the If the drum of,

speed any desired point depending on the value of resistance 53.

The motor 13 will now travel at a reduced speed until the point is reached at which it is desired to stop the travel of the ramin this direction. Contacts 28 and 28 are so adjusted that they will be opened by the nut 27 at this time. Opening of contact 28 opens the control circuit to one side of magnet coils of switches 34, 35 and 7 50, thereby opening the contact 28, will de-energize the coils of the switches 34, 35 and 50, and cause these switches to open, breaking the circuit to the motor. The opposite sides of the coils of switches 34, S0 35 and 50 are opened when contact 28 is opened as an added precaution in case of grounds or other trouble in the control circuits. Itwill thus be readily seen that the motor 13 is slowed down and finally stopped without and independent of the master controller 22.

, The ram having reached this position, the coke will have been entirely pushed from the oven and the ram will then be returned to its original position as follows: Drum of master controller 22 will be moved in the direction of the arrow marked Out?; On the first notch a control circuit will be established from the minus line of master switch 37 through wire 38, through drum of master controller 22 to wire 43 to contact 29 of limit switch Y to wire 55', then to one side of magnet coils of switches 32 and 33, through the coils'to wire 56 to 190 contact 29, then through wire 57 to wire 42 to plus side of master switch 37 thus closing the switches 32 and 33 and making a circuit to motor 13 in the reverse direction thus operating the motor to draw the ram back out of the oven. The reverse motor circuit thus made is as follows-from the positive or plus side of main switch 63, through wires 64 and 73 to switch 32, then through wires 75 and 66 to the m armature of motor 13, then the armature to wires 65 and 74, to switch 33, then through wire 68, series field 69 and wire 7 O, to starting resistance 71, then through wire 72 to negative or minus side of switch 63. In the same way as described for the opposite half of cycle, contacts 28 and 28 and 31 and 31 are closed and 3l opened by nut 27 traveling along shaft 25 in the direction of arrow marked Out. The operation of these contacts closes the control circuit for accelerating switch'36 and the motor is brought to full speed in the reverse direction from the first half of cycle. The motor will continue to run at this speed until contacts 30 and 30 are opened. and 30 is closed 'by the nut 27. These contacts are so adjusted that they will be operated when the ram approaches the end of its travel. Opening of contacts 1 36 through wires 43 and 47, causing this 30 and 30* opens the control circuit to the magnet coil 46 ofthe accelerating switch switch to open. At the same time closing of contact 30 -establishes a control circuit from the plus line of master switch 37 through wire 47, contact 30 to wire 59, to one side of the magnet coil of a slowdown switch 60, through the coil to wire' 55 to contact 29 of limit switch Y .to wire 43 to master controller 22, a through the drum of the controller towire 38 and to the minus side of master switch 37, thus closing slow-down switch 60 and connecting the resistance 62 in parallel with the armature of ram motor 13, and reducing the speed thereof.

The motor will run at this reduced speed until nut 27 returns to its original position when contacts 29 and.29 will be opened.

Contact 29*, when opened, will open the wire 55, thereby breaking the circuit to one side of magnet coils of switches 32, 33 and (30, opening these switches and stopping the' motor at" the limit of the travel of the ram. This stopping of the motor is entirely automatic and .independent of the controller 22 which may remain in fullspeed position. Opening of contact 29 opens the circuit through wires 56 and 57 to the opposite side of magnet coils of switches 32 and 33 and is an added precaution, as explained above, for switches 34'and 35.

While one specific embodiment of this invention is shown and described in de tail it will be understood thatvI do not wish to be limited thereto since various modifications in design, and combination of parts may readily be made by those skilled in theart without departing from the spirit of my claim.

I claim a In a motor control, the combination with a motor, of a source of current .for said motor, a magnetic controller adapted to invention as defined in the appended control the circuits to said motor, a hand operated master controller adapted to make and break the control circuits to said ma netic controller, and an automatic linnt switch'adapted to be actuated by said motor to successively cut in suitable resistance in the motor circuit to slow down said motor and to break said control circuits to said magnetic controller at predetermined times, independent of said master controlbe actuated by said nut as it moves along said rod.

In testimony whereof, I have hereunto set my "hand. k s

GEORGE LAMBERTON. 

